UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

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☐	Preliminary Proxy Statement
☐	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
☐	Definitive Proxy Statement
☒	Definitive Additional Materials
☐	Soliciting Material Under Rule 14a-12

Albireo Pharma, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on June 08, 2018
	Meeting Information
	Meeting Type: Annual Meeting
ALBIREO PHARMA INC.	For holders as of: April 18, 2018
	Date:  June 08, 2018	Time: 8:30 AM EDT
	Location:   10 Post Office Square
	Suite 502 South
	Boston, MA 02109
	You are receiving this communication because you hold shares in the above named company. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting.
	See the reverse side of this notice to obtain proxy materials and voting instructions.

—  Before You Vote  —

How to Access the Proxy Materials

Proxy Materials Available to VIEW or RECEIVE:

1. Annual Report        2. Notice & Proxy Statement

How to View Online:

Have the information that is printed in the box marked by the arrow      (located on the following page) and visit: www.proxyvote.com.

How to Request and Receive a PAPER or E-MAIL Copy:

If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request:

                               1) BY INTERNET:         www.proxyvote.com

                               2) BY TELEPHONE:     1-800-579-1639

                               3) BY E-MAIL*:             sendmaterial@proxyvote.com

*  If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow     (located on the following page) in the subject line.

Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 27, 2018 to facilitate timely delivery.

—  How To Vote  —

Please Choose One of the Following Voting Methods

	Vote In Person: If you choose to vote these shares in person at the meeting, you must request a “legal proxy.” To do so, please follow the instructions at www.proxyvote.com or request a paper copy of the materials, which will contain the appropriate instructions. Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow     available and follow the instructions.
	Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a voting instruction form.	Internal Use Only

Voting items

	The Board of Directors recommends that you vote FOR the following:
	1.	Election of Directors
		Nominees
	01	Ronald H.W. Cooper	02   Anne Klibanski, M.D.	03   Stephanie S. Okey, M.S.
	The Board of Directors recommends you vote FOR the following proposal(s):
	2.	To approve the Albireo Pharma, Inc. 2018 Equity Incentive Plan.
	3.	To approve the Albireo Pharma, Inc. 2018 Employee Stock Purchase Plan.
	4.	To ratify the appointment of Ernst & Young LLP as Albireo’s independent registered public accounting firm for the fiscal year ending December 31, 2018.
	NOTE:  Such other business as may properly come before the meeting or any adjournment or postponement thereof.

Reserved for Broadridge Internal Control Information  

Voting Instructions

	THIS SPACE RESERVED FOR LANGUAGE PERTAINING TO BANKS AND BROKERS AS REQUIRED BY THE NEW YORK STOCK EXCHANGE
		Broadridge Internal Use Only
	THIS SPACE RESERVED FOR SIGNATURES IF APPLICABLE	Job  # Envelope  # Sequence  # #  of  # Sequence  #